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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b724ef6393e22ba755eceef5c0b08e8630aa513e05b3e374541f66a63eb8f2a' 
  AND token = 'hQjz7dwu3XF5QecnFQTkSNLuGSyppQjM9aSdDzcm550=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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