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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8685854c533b3c2a06c04fe2125a4c2a19da4a1bffbc38e04277af29382e2de' 
  AND token = 'CWdNcF5QxJELMNQ/JSkE613Ld+WsfnI/E4HJ+R3ggnY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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