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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd1d64efdafdde5afc50621f12375a4c4e9c86518be4ee1dd4e42fbb4c4f063b' 
  AND token = 'YXQS40evKiJ2YYDNBFgnvBSg2qtkIoDQ/i0tR+8TJMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}