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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7471b4bcf28d92e7227fec7fe1ee301e6078af166f5c2753509ee4c4ec6b66b2' 
  AND token = 'C7XxiqFny4u8/Ok51JZDfIDCOEyOl8jrQVvK8iwk5gQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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