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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2165426d7b204d9db88ccc26fcbcc7ea072c960f2dc6abcdd5fd4b8817ca65' 
  AND token = '1pdUNOyrTSQ7gWW5xT1/nWSFC0ftOM6tJHbTzCGZ/Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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