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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0549809b4cc96cee96a89c9a411c8d9ae36fd96621b9c1dde0cfe4c8100f4bc' 
  AND token = 'LtyP/G5maMuGgIyVEMP7jNdr6exy3h2e1cCO4jgfOIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00071

JSON explain

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