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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7efa587b0f53c9088acf54f1e0de6471256fa620c973aad8717142f3df95e71a' 
  AND token = '63gpcEaTI+/4PRMBiZcOwkphRWm0SRPey6nUxMRePMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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