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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '14b075836dea4205579754a3e5691c132bd538113c9cd875c715cb20c32b7db7' 
  AND token = 'I8WIyN25dB3hV2t9LKuhyh/p1ex3OfVoig50S8xA05A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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