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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9396ad5d5e4187db7c9fd92a6156b228a4c3145d6693dd4caff0872ded2a5348' 
  AND token = '8ZeOnNjEVVmjH+NdPYB02D7aq5/5TFsTeCLLydSv6pc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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