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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2afc02e1485676d85bce53051365cec13460b7b17e86cfd989988e912d51567c' 
  AND token = '3COUu2SegWkLCweqQ0G1ew7TESUlNvUG2ddKzEaHC3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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