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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '906e401e5cd11818ef1c54852cb1399dcce1fd42fbcb6897a7fd9cc4f93b1de3' 
  AND token = 'PiN2Y8Gdt0jSEXEe3CQJ2eksn5vCt/4JOm6XxlCVakU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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