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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01613b4656d29f509b86bb4c6ea6625345cd19ddf724958c89a5e31904a6f722' 
  AND token = 'F1YyydGke/EoEWwv5v9DxRRww/uKvZYoimT2kE5y5hM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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