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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b286a4631f9bd090b67997f8fcd4ca85e2df4516cb1975f4c1e36b220ed4daae' 
  AND token = 'f01xJ1vUh/orxbHB444aki3NMG/Ew+0McBvw0h3GZDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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