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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd61c95135880788b288a6c24c5289bf4b69983e4caf97ebd8d8ee1d8dc5cbd8e' 
  AND token = 'mcgExexSMLzf9OhZc6p67qCnj8B81b7G3cWaq/qjHfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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