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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7701504b6fd8e5ad1864220f8030d8600b026db6a8d7bf68383f0e3b253f28e7' 
  AND token = 'l6QG0Jm6JR5qbES/DkqD8OvC87d0kaidhmhkT6Oa+x4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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