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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc66a99bc4c02a453c8dc68d14cc6a7720cb061dd7a0c989dff1c31e0327cb7' 
  AND token = 'Jf+fO3wULk8D7+3cyOM4fUVAT17e3Im7Hm+nhT6yfuQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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