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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9636670bda2954ed6f8c8dec392f997de6963d3aefbb58dedd5a403896478ca5' 
  AND token = '27dTTQNCvIHcZWECV182M5vH0rJLd/A2ycPArepxJEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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