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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffd5741a01f60cd9e0d47ec34c08ab1f0e7460e9030f837d718fa0822fb5813' 
  AND token = '/mKD3K14z8EjIjFLU24KWPv6YWKDwlTz/xnqaL9UaFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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