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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2929f3da604ce2ab1fd6467301c84eea3d27086e338af744316d6bf5ea9825d6' 
  AND token = 'WsAAvNl5TMA0lOOhDVxAgBX5dDAWjT12Kdwee9BCLW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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