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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f7df5f7a083521a9a720bd4806d9e14adac9bad6a6ea026899d16a1bf4c719d' 
  AND token = '1CDpvhCgtIrZsiC4dVUYH/7LZARxdFyvlVRM8oMBOwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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