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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f56cca245efd926c32c995fe4f2b2876686653d6b543b027272779ff30a7e6' 
  AND token = '3sjUZF+GbPHFCBlmf7yZp7noXQ0p0lF9mesL84mqhuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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