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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d7025d607c068f8c102be310fbd1febdaeb97e2aa3b4da7233babfc83dd9afc' 
  AND token = '5y02n76s3cebS8sN71JwGm+/Yt/KubgeqhKszShRK5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

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