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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '998244c7ac0dce94ee92372c373a310635e742292eee1398a8064e8510c61edc' 
  AND token = 'Drl2/m8+JrULp7bSusDG1xj4IkENgzLo9kzmCBBnBKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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