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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd868e0272756e3cce08f03bdd597945ba33167b232b3a56ccacaf3ee76cac31b' 
  AND token = 'NKjmmd/d+1iEjEZI0gAXpB55b2X2B2ZeHhp7JmMrXuc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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