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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce7a114e01f2a9e9445647c6c0b80b896c8913f5ac95b11a0402c3b7d4fcfab8' 
  AND token = '/Vkggchlr0OiaetgbUHTtGx5ncGJa8A5gz/A/MFU2N4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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