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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc828ff73fa0cc806abbcf1ec8ae2006fbca0911e75882bfccd7ff2cc119671' 
  AND token = 'F/uPtdXG1gOcCc8PqgZNcX4CYUM4UOqC44cw8Q4akLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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