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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ee9bdde0b13a1b7d00797d5322cc6451b38253d2af5a4d28073c51d34c4dc41' 
  AND token = 'wQBNCmzZR+PPoopymtbNKHQczf6cqXNaXco8hI9GZAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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