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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd0634b6014bef1626f345b235e98af9aa792cf950ac71bff01cf251352a0600' 
  AND token = 'm3urcvu6eqZZ3k7PpENfLc/VWNFUZ27zXhKwC3SE8AQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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