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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98448876eb68307ee64dac580b4248d817b041a01c5d2dcb2027171336b9128c' 
  AND token = 'OHz2QkH7LorTwk0qqQ4VoUyj8So2da1Pevn+JNpXro8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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