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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd84957254ae3acf986c78aad21e5620a8d0a210bd8a20b461de4761d26bc5b4' 
  AND token = 'DHU9zAKfh85vFfhHeA7X6HluRIoJItyGAEedmUWKi+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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