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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56a8d27be0c80c371e9514de75b9fe7e4935bcc566322e4d49df05cc5ab88625' 
  AND token = '6lkCt1ssI+nEWHw23NVlH7fbb7CXyqDwD5+YEEH69GY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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