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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '697d8b51fe8697d6ae50e891594b174ec75b630b2409215e039c4734dbaa5773' 
  AND token = 'vZm1M+qyni0nUm2oosUgpHmbIWNpJrjzNmfdge6d+FE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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