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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b53cba7bbe7b8037df98c1b498e1843ec89158067a3c26bdd3987026dcb60d5c' 
  AND token = 'O25NOJru6j/3+7qgsELuCV7cSbFWlX1sFkwXa3Igwlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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