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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19551b400c5109b6b4b68a75dada03cee49a8af9f6e8b34be77dd2b942c35e33' 
  AND token = 'mHXoq7u4N6y07SZoSRHdBeDaVqUIzzmNI3cypCpN1Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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