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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c621f8ef60678f9f7179a1167adeb4f0b21dbb0dc481ebcf8d791430343d8677' 
  AND token = '0dzv3tgo3EX6eqoYIkIDT9fRUK+ExK4A9du+PoZOMag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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