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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85656579269bc70d09c2267023df7cd89c41e9125d603b170f60e59f5a85a0a5' 
  AND token = 'rjMCQVZuZFVcuLDNZQkjMNIxPHkUxEY4eimW5ODmrLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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