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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54e2038768bbf1d94265d3475f72f3d75dc83fe33307bb2acaeaa0e5b449a305' 
  AND token = 'Cpp57ZF5V0HpcsVLj2gvQTsg81FIEB40xoE3en21Eik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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