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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7351c838cf7cf6b616e601afbdfbaa8ee1bd56f65064f74ceaf538f8ff58d26d' 
  AND token = 'Zo+LtilFaCkVSAaRyz92ZtTAKvzQw8Cy7kldpJkf7GU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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