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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98369193b66de2dba986ccb64d36db8fc3c2b1a86ac368addb54a6e4cb207b47' 
  AND token = 'r1ActxwgAtXIuIO4Tp2g4rDCI6STY2TOUDFHJDJqAzE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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