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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ca2d4863c0bf6c350889c4774e81f58d030a43d946b5893c429210442afa7f7' 
  AND token = 'n96Ay7eyTdcCv4GrBmyDv+ioRmctHnNZO2XkGq9v4uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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