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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ce3481409f507b2b0ecc7d23a732669855b217f87af544ac3f7126f1643826' 
  AND token = 'A6QT8GY4aqdyedhi7Woz8J18GPqsuyT59O00+HVbtiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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