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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d8411144ded1368e1098320b66681cc54311bf3ef693d17eb0b4ae188a986f' 
  AND token = '6GDbQgEtCjz4bVUW597Rk+oexVKbS4hEsBP47Gx9iJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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