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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dd260fa06e84bd56ae4527b162d1173431255f38f7f5191e54ba31f5b8bf1a9' 
  AND token = 'LQznL2d7tdM4LggvAvWJFOF/7DU8bGdjYjN91u7vG0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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