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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '470fbeaa2de04bd6b29c2e7aa2648f9b6901f311d7f442f5a140d971dc316898' 
  AND token = 'kyNNvZjlJigbj+bQyXAkXKi3mN5iDcSS0sALUH7L2cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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