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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b3f3c1a57ea8aab0619cac513998cc3202e53a70cfdf18597953f815a2bb7e' 
  AND token = 'ABurVJT32dkNOdbro3a8FDJbbflBKlfyMsbfTbL78p8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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