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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81afa74de67c555ce6e149459be10add618cd0a9b48b50792ec866e0135f47e8' 
  AND token = 'bvwdsUdbrBPkQpL9kh9ebeh6688OzTFBgVKoQdlilms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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