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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '195a1e4a9cae0711e2f69708669b2ed18debf2413b10e2dee48d7952d7c65055' 
  AND token = 'Z/Qq9bTNgmry7H//J+xkpnFnvqPD9HKZU7ms7QLnDoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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