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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23cc503137218f158ff1f5ed85e64ba85d71b64c61fc05507ebf86d7a05aaa2e' 
  AND token = 'aQ2w1yKQH8I4bbrJC35qonyPR/ZFr1U7MXq8XqQjYAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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