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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9994e6cadc2f5e5a1a93a69d3a3bdc504807ffb39cabd6a5ebe30c0ae22553bc' 
  AND token = 'QoaWuVFCuyjz0qDC7wuX3X41Yoe21Huy6qXanE4NCUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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