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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dc8b53d1e8a8d534047ef4d4831a463ce93f06ad3c8ef154a5db5a417e20e9c' 
  AND token = 'mroGFMbq+RqXegeAuA+yuYsk5s6syYs+49+rjGZfBz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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