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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cfc6d18f1bbc36c309f4ccac5701a3a21e70238ca1bafc2f0ef55f6d82fc055' 
  AND token = 'RVrMFv0h/x5faSuCWXO/mwOZKm5HVYfgNAhkPbKlAHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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