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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd13c89ecca7be40d73351ad6d4fb5583a592b9ea70b64753ffcd0c1a6290d5e' 
  AND token = 'V/I0vt7JC0J89ZF1oM0BrsVEpf1wnrCMY2A4UA2tGbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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