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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '102a055a5d9cecf77e7f2df9b3cc5610b2cf510e1b8fc95e8163165250926217' 
  AND token = 'HSARmEnMvEBXqD74GKgLm/9fQmWdunsx0SBGPmmvCG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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