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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc8297ce23a223bdd22ef56b3fb26df8d92d856e866920393a1b7cd3314b488e' 
  AND token = 'Iz5FzikaE1g11+alN4ch74FxpdyfuR1ICiEaEPfQ/OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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