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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42b380b9f60afaf73066c48092ee6747d630a7a8a1e67e51cd9e79dbc6e8198b' 
  AND token = 'quWc7SQdZOQplkqFp9hQWClcsNviUN6jrUhSwgTAc5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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